package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // 对前端传来的明文密码进行md5加密处理
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus().equals(StatusConstant.DISABLE)) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();

        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);

        //设置密码, 默认123456 (进行md5加密处理)
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置账号状态, 默认正常状态 1表示正常 0表示锁定
        employee.setStatus(StatusConstant.ENABLE);

        //设置当前记录的创建时间和更新时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());

        //设置当前记录创建人id和修改人id
        // 获取解析JWT令牌时存入的当前线程所对应的线程局部变量(用户ID)
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.insert(employee);
    }

    /**
     * 员工分页查询
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // select * from employee limit 0,10
        // 调用PageHelper插件开始分页
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());

        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);

        long total = page.getTotal();
        List<Employee> records = page.getResult();

        return new PageResult(total, records);
    }

    /**
     * 启用禁用员工账号
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {

        Employee employee = Employee.builder()
                .status(status)
                .id(id)
//                .updateTime(LocalDateTime.now())
//                .updateUser(BaseContext.getCurrentId())
                .build();

        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工信息
     *
     * @param id
     * @return
     */
    @Override
    public Employee getEmployeeById(Long id) {
        Employee employee = employeeMapper.getEmployeeById(id);
        // TODO 彩蛋 暂定
        employee.setPassword("大sb,还想偷看密码,想得美");
        return employee;
    }

    /**
     * 编辑员工信息
     *
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);

//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.update(employee);
    }

    /**
     * 修改密码
     *
     * @param passwordEditDTO
     */
    @Override
    public void updateEmployeePassword(PasswordEditDTO passwordEditDTO) {
        // TODO 前后端联调发起修改密码请求时 PasswordEditDTO 未向服务端传输当前登录员工id
        //  原因未知 猜测为前端未按照接口文档,传员工id参数
        //  当前处理方式为从线程隔离区获取当当前登录员工id
        //  或需要后期修改前端代码?
        //long empId = passwordEditDTO.getEmpId();
        Employee employee = employeeMapper.getEmployeeById(BaseContext.getCurrentId());
        //从数据库获取加密后的旧密码
        String oldPassword = employee.getPassword();
        //获取传入的旧密码并对其进行md5加密处理
        String oldPasswordJDBC = DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes());
        //获取传入的新密码并对其进行md5加密处理
        String newPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes());
        if (!oldPassword.equals(oldPasswordJDBC)) {
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        } else {
            employee.setPassword(newPassword);
            employeeMapper.updateEmployeePassword(employee);
        }
    }

}
